13
221462C
6 Commissioning
Fit the outer case, secure with the screws previously removed.
Make sure that the pilot is alight and stable, view through
window “G”.
Set the control thermostat knob “A” between “MIN” and “MAX”
(“MAX” is about 82
o
C (180
o
F) and check that the burner lights
smoothly. Check all gas connections for soundness with a
suitable leak detection fluid.
Note. Should the boiler fail to operate correctly refer to Fault
Finding Section.
To set the burner pressure operate the boiler for 10 minutes,
remove the gas valve cover, if not already removed, adjust the
gas pressure by screw “H” until the required pressure is obtained,
see the relevant Table 1 for setting pressures.
Stick the self adhesive arrow, from the loose items pack, in the
appropriate space beneath “MIN” and “MAX” column on the
data label.
Should any doubt exist about the gas rate this should be
checked at the meter, using a stop watch to time at least one
cubic foot of gas consumption.
Replace the gas valve cover.
Remove the pressure gauge and refit the screw, make sure that
a gas tight seal is made.
6.4 Testing
Check the operation of the flame failure device on the boiler to
make sure that the gas valve shuts down within 60 seconds,
indicated by a “click” from the valve.
MODEL AND SERIAL
NUMBER PLATE
A
K
L
G
H
B
J. (Shown Off)
C
A. CONTROL THERMOSTAT KNOB
B. GAS CONTROL KNOB
C. IGNITER BUTTON
G. VIEWING WINDOW
H. GAS RATE ADJUSTMENT SCREW
(UNDER COVER SCREW)
J. GAS SERVICE COCK
K. PRESSURE TEST POINT
L. PILOT BURNER
ADJUSTMENT SCREW
M. FLUE BLOCKAGE SAFETY DEVICE
RESET SWITCH
M
Diagram 6.1
5354
6.5 Flushing
Allow the system to reach maximum working temperature and
examine for water leaks.
The boiler should then be turned off and the system drained as
rapidly as possible whilst still hot.
Refill the system and vent and check for water soundness as
before.
6.6 Adjustment - All Systems
When commissioning the system the boiler should first be fired
on full service, that is, central heating and domestic hot water.
The system should then be balanced, adjusting the pump and
lockshield valve as necessary. Having achieved a satisfactory
condition operate the boiler with the bypass fully closed on
minimum load, normally this will be central heating with one
radiator, in the main living area working. The valve should then
be gradually opened to achieve a flow rate of 7.8L/min (1.7gal/
min).
Under no circumstances should this valve be left in the fully
closed position.
Operate the boiler again on full service and check the balancing,
making further adjustments as necessary.
If thermostatic radiator valves are fitted care must be taken to
make sure adequate flow through the boiler when they close,
refer to the current issue of BS7478.
Do not attempt to adjust the thermostat calibration screw.
Test the boiler for spillage of the flue products at the draught
diverter as detailed in the current issue of BS5440 Part 1. See
also Section 2.3.
